D–EIMWC00808-16HU - 17/64
Evaporator and Condenser Water Piping
All evaporators and condensers come standard with Victaulic AWWA C-606
groove nozzles (also suitable for welding), or optional flange connections.
The installing contractor must provide matching mechanical connections or
transitions of the size and type required. A heat recovery chiller, DHSC,
(shown on the right) has two sets of condenser piping; one for the tower, one
for the heating system.
The tower connections are always the inboard pair of connections. In the
figure to the right, the condenser connections are “left-hand” when viewed
from the front of the unit (Unit Control Panel and Interface Panel side), so in
this case, the right-hand condenser connections would be for the tower.
If the condenser connections were on the other end (“right-hand”), the tower
connections would be the left-hand pair of
Important Note on Welding
If welding is to be performed on the mechanical or flange connections, remove
the solid-state temperature sensor and thermostat bulbs from the wells to prevent damage to those components. Also
properly ground the unit or severe damage to the MicroTech II unit controller can occur.
Water pressure gauge connection taps and gauges must be provided in the field piping at the inlet and outlet connections
of both vessels for measuring the water pressure drops. The pressure drops and flow rates for the various evaporators
and condensers are job specific and the original job documentation can be consulted for this information. Refer to the
nameplate on the vessel shell for identification.
Be sure that water inlet and outlet connections match certified drawings and stenciled nozzle markings. The condenser
is connected with the coolest water entering at the bottom to maximize subcooling.
Note
: When common piping is used for both heating and cooling modes, care must be taken to provide that
water flowing through the evaporator cannot exceed 110°F which can cause the relief valve to discharge
refrigerant or damage controls.
The piping must be supported to eliminate weight and strain on the fittings and connections. Piping must also be
adequately insulated. A cleanable 20-mesh water strainer must be installed in both water inlet lines. Sufficient shutoff
valves must be installed to permit draining the water from the evaporator or condenser without draining the complete
system.
Flow Switch
A water flow switch must be installed to signal the presence of adequate water flow to the vessels before the unit can
start. They also serve to shut down the unit in the event that water flow is interrupted to guard against evaporator freeze-
up or excessive discharge pressure.
Thermal dispersion flow switches are available from Daikin as a factory-mounted option. It is mounted in an evaporator
and condenser water nozzle and factory wired.
A paddle type flow switch can be supplied by the owner for field mounting and wiring.
